The National Journal each year analyzes a series of key votes of each member of Congress and calculates how liberal and conservative the lawmakers are compared to one another. Their results this year show that the Congress in 2010 was more polarized than ever, with Democrats moving further to the left and Republicans to the right.

U.S. Sen. Bob Casey scored 79 percent liberal and 20 percent conservative. Those scores were nearly identical to his ratings in 2008, but a huge leap from 2009 when he was one of the most centrist senators with a 56 percent liberal rating and 44 percent conservative.

Local U.S. House members are moderate overall with Lehigh Valley Republican Charlie Dent being the most consistent. His score of 39 percent liberal and 60 percent conservative has only fluctuated by a few points from year to year.

Tim Holden, one of the most conservative Democrats in the U.S. House, received a 55 percent conservative score, his highest yet. In 2008 he had a liberal score of 59 percent.

Jim Gerlach, a Republican, also had a more conservative year than in the past, scoring 69 percent conservative and 31 percent liberal.

The Pennsylvania lawmakers with the greatest extremes were Lancaster County Republican Joe Pitts, who scored an 88 percent conservative ranking and 12 percent liberal and Allegheny County Democrat Mike Doyle with 92 percent liberal and 8 percent conservative.